Engaging in any textual activity. The status of sending text messages on a semi-regular basis.

Doctor: 'Son, are you textually active?'
Teen: 'ya, but never with the same phone'
Doctor: 'what?'
Teen: 'I never text on the same phone, i like to feel different keyboards.'
Doctor: 'nice...'
Doctor: 'you have the H.I.V'

When you are staring a new relationship with someone. It first starts out through texting each other. Before you are sexually active in the relationship you are textually active. No sex involved..just text.

Me and that girl are just textually active...nothing serious yet. Just texting to get to know each other.